I've vistited a few of the Beatle homes.
John and Paul lived closest to each other I reckon. Walking distance if you're not a lazy type.
There are a couple of large roads leading into upto the Penny Lane roundabout bus shelter ( now a diner) Menlove avenue is where John lived, its a dual carriage way. The next avenue along is called Mather Avenue. There is ( or was when i went) a large golf course between the two. Pauls road is off Mather Avenue ( Forthlin Rd) It's a cul de sac street If I recall correctly.
Not sure where George's first home but when he was a little older they moved out to Speke. Speke Is quite a way out of town, near liverpool airport (now John Lennon airport) Not close to John and Paul. Ringo's area , the dingle, now toxteth is cloer to town than john and paul. John and paul were in the suburbs. Pete Best was in West Derby which is not even on the same side of town.
This site may be handy to you .
http://www.theaa.com/travelwatch/planner_main.jspsimple put the address in the start destination and put another beatle address in the final destination. When asked to verify, click the box that says you need a map and it will show you the route from one house to the other
;-)